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JEE Main & Advanced AIEEE Solved Paper-2008

  • question_answer
    The \[p{{K}_{a}}\] of a weak acid, HA is 4.80. The \[p{{K}_{b}}\] of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be       AIEEE  Solved  Paper-2007

    A) 7.01

    B)                        9.22       

    C) 9.58                       

    D) 4.79

    Correct Answer: A

    Solution :

                    \[{{B}^{+}}+{{A}^{-}}+{{H}_{2}}OBOH+HA\] \[pH=\frac{1}{2}p{{K}_{w}}\,+\frac{1}{2}\,p{{K}_{a}}\,-\frac{1}{2}\,p{{K}_{b}}\,=\frac{1}{2}\] (14 + 4.80 ? 4.78) = 7.01


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